<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style type="text/css">
        .basic{
            height:80px;
            width:80px;
            background-color:#DBDBDB;
            float:left;
            margin:2px;
            text-align: center;
            line-height: 80px;
            color: white;
        }
        .row{
            height:80px;
            clear:both;
        }
    </style>
</head>
 
<body>
    <div>score:<span id='score' style="font-size:200%;font-weight:bold;"></span></div>
    <div id="pool"></div>
    <div id="sample" class="basic" style='opacity: 0;'></div>
    
     
    <script src="js/index.js"></script>
</body>
</html> 